Einstein observatory catalog of IPC x-ray sources  vol. 5 
Einstein Catalog Committee                                   
 - Cambridge  Smithsonian Astrophysical Observatory  1990 
 - iii, 769p. 
 - v. 5 .
<br/><br/><label>Subjects--Topical Terms: </label><br/>X-Ray sources, Catalog-Imaging Propotional Counter
<br/><br/><label>Universal Decimal Class. No.: </label>017:52-73  / EIN.5